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Measuring the length of a second might seem simple, but this history of the time unit from TED-Ed shows how the road to the modern, standardised second was anything but. Written by John Kitching, a Fellow at the US National Institute of Standards and Technology, the video details how the advent of global communications and transit systems left the world in need of a more precise and universal understanding of a second – and how that search ultimately led to the atomic clock.
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Design and fashion
A ceramicist puts her own bawdy spin on the folk language of pottery
14 minutes
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Animals and humans
Villagers struggle to keep their beloved, endangered ape population afloat
19 minutes
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Language and linguistics
Why Susan listens to recordings of herself speaking a language she no longer remembers
5 minutes
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Ethics
Plato saw little value in privacy. How do his ideas hold up in the information age?
5 minutes
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Biology
Starlings swoosh like brushstrokes across the sky in this dazzling short
3 minutes
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Information and communication
‘Astonished and somewhat terrified’ – Victorians’ reactions to the phonograph
36 minutes
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Engineering
From simple motors to levitating trains – how design shapes innovation
23 minutes
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Animals and humans
Are zoos and natural history museums born of a desire to understand, or to control?
57 minutes
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Archaeology
What’s an ancient Greek brick doing in a Sumerian city? An archeological investigation
16 minutes